Crest FA901 set, Fa preamp old style Schematic
8
7
6
5
4
3
2
1
5
+
6
-
OPA2604AU
5
6
R24
100K
R46
11K0/1W
R49
549R0
PREAMP OUT CH A
IC4B
R17
6K8
OPA2604AU
+
-
3
7
7
2.2/5%/63V
IC2B
C13
4.7/35V
R30
10K
1N4148
C9
2.2/5%/63V
R16
6K8
NE5517AD
C11
R34
150K
D11
1N4148
150K
R27
D9
R18
10K
IC3
R19
10K
R13
1K5
1/35V/TS
R26
4K7
R41
A
+22V
R40
A
2
3
D4
C2
1/35V/TS
R42
A
OPA2604AU
6
5
R7
NOTE 2
C4 30pF
84
IC1A
OPA2604AU
-
+
-22V
R43
A
C6 30pF
IC1B
-
7
+
1
R9
NOTE 2
5
C1
D D
1
2
3
4
5
6
7
8
J3
CH A OCTAL
+22V
-22V
J1
26-48-1036
26-48-1036
C C
B B
J5
A A
HEADER 24
ANALOG GND
1
VR SEND CH A
2
VR RET CH A
3
J6
ANALOG GND
1
VR SEND CH B
2
VR RET CH B
3
J2
ATT. CH A
1
DATA CH B
2
DIG. GND
3
DIG. GND
4
+22V
5
ANALOG GND
6
ATT. CH B
7
POWER GND
8
-22V
9
ANALOG GND
10
DATA CH A
11
+15 V
12
DUAL ROW HEADER
GROUND
.25 LUG
1
2
3
4
5
6
7
8
J4
CH B OCTAL
S B P
P B S
+OCT IN CH A
1
-OCT IN CH A
2
+OCT IN CH B
3
-OCT IN CH B
4
ATT CH A
5
+22 V
6
7
LO OUT CH A
8
9
LO OUT CH B
10
-22 V
11
LINE CH A
12
LINE CH B
13
DATA CH B
14
GND
15
GND
16
GND
17
DIG. GND REV NOTES 5/28/93
18
ATT CH B
19
GND
20
GND
21
GND
22
DATA CH A
23
+15V AUX
24
8
SW1
MSSA????
SSPPB
B
7
1/35V/TS
D1
1N4148
R2
10K0
D2
1N4148
1N4148
1N4148
1N4148
C3
30pF
J10
1
2
3
A
D5
1N4148
1N4148
D6
D8
-22V
R3 10K0
J7
A
R45
3
2
1
A
R1
A
R6
NOTE 2
R4
10K0
R5
10K/1%
J8
A
R44
3
2
A
1
R22
A
R8
NOTE 2
REV NOTES 5/25/93
(1) ADDED J19 GROUND
(2) MOVED MODE SWITCH TO PRE OCTALS
(3) CHANGED ALL 24V'S TO 22V
(1) CHANGED C13,C14 NET FROM -22V TO - 16V NET
(2) DELETED CHIP CHA & B
(3) DELETED GROUND ON PIN 13 OF J2 AND CHANGED
TO A 12 PIN CONNECTOR
(4) TIED J3 PIN 2 TO GND PLANE
6
D3
1N4148
+22V
D7
C5
30pF
J9
3
2
1
A
CH A RETURNCH A RETURN
ANALOG GND
CH B RETURN
CH B OTA
CH A OTA
CH A OUTPUT
CH B OUTPUT
REV NOTES 6/2/93
(1) CHANGED CONNECTIONS ON J2 & J5
(2) REMOVED J10,J11,J13,J15,J16,J17,J18,J19
ADDED J24 & J25 IN THEIR PLACE
(3) RE-ANOTATTED REFERENCE DESIGNATIONS
REV NOTES 10/20/93
(1) SWAPPED AND CORRECTED IC4A INPUT
(2) DELETED R32, R33
REV NOTES 10/25/93
(1) CORRECTED POLARITY J5-2 & J5-3
4
11K0/1W
549R0
R38
100K
R10
100K
C7
220pF
R14
1K5
R35
750R
R36
750R
R15
1K5
C8
220pF
R11
100K
R39
100K
R23
4K7
R47
R48
GND
C10
2.2/5%/63V
R12
1K5
1234567
C16
C12
2.2/5%/63V
1
2
3
4
J12
22-58-1504
OPA2604AU
D10
1N4148
R25
100K
4.7/35V
D12
1N4148
+22V
R28
4K7
+22V
84
IC4A
2
-
1
3
+
-22V
C15
1/35V/TS
10111213141516
8 9
R20
47K
R21
47K
-22V
C14
R31
10K
PREAMP OUT CH B
1
SERVO IN CH A
2
SERVO IN CH B
3
GND
4
J11
R29
4K7
+22V
2
3
84
+-IC2A
OPA2604AU
1
22-58-1504
-22V
CREST AUDIO INC.
150 Florence Avenue
Hawthorne, NJ 07506
Title
FA SERIES OCTAL PREAMP
Size Document Number Rev
21C1508
C
Date: Sheet of
2
1 1Thursday, May 18, 2000
1
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